As observed, there are 4 RTP streams, but the first and third one have almost 4% packet loss.Select one of them and then select 'Analyze'.After this step, a graph as the below image will be generated:
The important sections of the particular graph are the Jitter and the percentage of the expected and lost RTP packet.
Troubleshooting.
There are many factors which can contribute to this problem but from the FortiGate’s perspective we can verify two basic functions.
1)CPUs:
If CPUs are highly occupied on processing other traffic, then this will probably cause packet loss.
Verify the status of each individual CPU by issuing the command diagnose system mpstat while users are experiencing poor voice quality.
Here an example:2) Physical Interfaces:
We need to also verify the drop counters of the interfaces involved on the particular traffic streams. By issuing the commands:- fnsysctl ifconfig <port number>
- diagnose hardware deviceinfo nic <port number>
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